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Publication numberUS20020118118 A1
Publication typeApplication
Application numberUS 09/791,595
Publication dateAug 29, 2002
Filing dateFeb 26, 2001
Priority dateFeb 26, 2001
Also published asCN1478351A, CN100571250C, DE60207992D1, DE60207992T2, EP1364515A1, EP1364515B1, US7259694, WO2002071722A1
Publication number09791595, 791595, US 2002/0118118 A1, US 2002/118118 A1, US 20020118118 A1, US 20020118118A1, US 2002118118 A1, US 2002118118A1, US-A1-20020118118, US-A1-2002118118, US2002/0118118A1, US2002/118118A1, US20020118118 A1, US20020118118A1, US2002118118 A1, US2002118118A1
InventorsJussi Myllymaki, Kevin Cao, Daniel Ford, Reiner Kraft
Original AssigneeInternational Business Machines Corporation
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Wireless communication system and method to provide geo-spatial related event data
US 20020118118 A1
Abstract
A system and method for communication of information that has particular significance to a specific location only to those individuals that are at or near that geo-spatial location. In particular, providing safety factor data and alerts is a preferred use of the invention. The invention allows information to be tailored to the individual at that location by selectively filtering what is communicated and what is not. The system includes a transmitting proximity event server, a GPS client wireless component that can be a personal wireless communication device (such as Palm Pilot, cellular digital phones, etc.) or personal computer configured for use within a global position satellite network.
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Claims(20)
What is claimed is:
1. A method of activating geo-spatial dependent data using a server and a global positioning satellite-based wireless component, said method comprising:
receiving input event data associated with a designated geo-spatial area at said server;
maintaining and updating said event managed data and event subscribed data at said server;
matching a profile that is subscribed to by entering a designated geo-spatial area by said wireless component; and
notifying said wireless component of said event subscribed data.
2. The method in claim 1, wherein said method comprises a personal safety advisor and said event data comprises safety-related events and said profile comprises a safety profile.
3. The method in claim 2, wherein said personal safety advisor includes calculating a weighted event score (WES) at said designated geo-spatial area defined as a product of ew*es, wherein ew is a weight associated with a safety-related event and es is a corresponding event score; and outputting said WES for display on said wireless component.
4. The method in claim 1, wherein said maintaining and updating said event managed data and said event subscribed data includes:
maintaining and updating a status record represented by a userid, eventid, and send status;
said event data represented by an object with attributes of said eventid, event type, event description, event location, event score, and a lifetime;
user location data represented by said userid, a location in latitude/longitude; and
profile record data represented by said userid, said event type, a distance threshold, a score weight, and a score threshold.
5. The method in claim 4, wherein said notifying said wireless component of said event subscribed data comprises:
obtaining user data and said event data;
requesting status of said userid and said eventid;
determining whether an event message was previously sent;
generating a message from said event data;
sending information to said wireless component; and
recording status as to sending said information for said userid and said eventid.
6. The method in claim 5, wherein said maintaining and said updating of said event managed data and said event subscribed data includes:
obtaining a new event object;
requesting said userids from a profile database wherein said event type matches said new event;
determining whether any more said userid;
requesting for each found said userid, a user location;
computing a distance of said user location and said event location using geo-spatial distance computations;
comparing said distance with an event distance threshold;
computing an event score for said user;
determining whether said event score exceeds said event score threshold; and
said notifying of said wireless component of said event subscribed data occurs when said event threshold distance and said score threshold are within predetermined values and there are no more said users.
7. The method in claim 5, wherein said maintaining and said updating of said event managed data and said event subscribed data includes:
obtaining a new userid;
requesting said event type for said userid;
determining whether any additional event types;
requesting for each said event type, an event location;
computing a distance of said user location and said event location using geo-spatial distance computations;
comparing said distance with an event distance threshold;
computing an event score for said user;
determining whether said event score exceeds said event score threshold; and
said notifying of said wireless component of said event subscribed data occurs when said event threshold distance and said score threshold are within predetermined values and there are no more said events.
8. A system for activating geo-spatial dependent data, the system comprising:
a global positioning satellite (GPS) wireless component configured for use with a remote wireless server,
said server including a server session manager operatively connected a location database and a matcher component;
a notification unit operatively connected to said matcher component;
an event database operatively connected to an event manager that receives external event data;
a profile database operatively connected to said matcher component;
and a status database operatively connected to said notification unit,
whereby a profile subscribed to causes transmission of geo-spatial dependent data when entering a designated geo-spatial area and said dependent data is provided to said wireless component.
9. The system in claim 8, wherein said system is a personal safety advisor system wherein said session manager comprises a profile manager, said event manager comprises a user session manager and a event manager, and said profile database comprises a safety profile database.
10. The system in claim 8, wherein said server and said wireless component each include a wide area network (WAN) interface, said WAN interface in said server is operatively connected to said server session manager and said notification unit.
11. The system in claim 8, wherein said wireless component includes a graphical user interface for output display of said geo-spatial dependent data.
12. The system in claim 10, wherein said wireless component includes a session manager operatively connected to said WAN interface and a GPS interface.
13. The system in claim 12, wherein said wireless component further includes a session manager that is operatively connected to graphical user interface.
14. A program storage device readable by machine, tangibly embodying a program of instructions executable by said machine to perform a method for activating geo-spatial dependent data using a server configured for use with a global positioning satellite-based wireless component, said method comprising:
receiving input event data associated with a designated geo-spatial area at said server;
maintaining and updating said event managed data and event subscribed data at said server;
matching a profile that is subscribed to when entering said designated geo-spatial area; and
notifying said wireless component of said event subscribed data.
15. The program storage device in claim 14, wherein said maintaining and updating said event managed data and said event subscribed data includes:
maintaining and updating a status record having a userid, eventid, and send status;
said event data represented by an object with attributes of said event id, event type, event description, event location, event score, and a lifetime;
user location data represented as said userid, a location in latitude/longitude; and
profile record data represented by said userid, said event type, a distance threshold, a score weight, and a score threshold.
16. The program storage device in claim 15, wherein output for notifying said wireless component of said event subscribed data comprises:
obtaining user data and said event data;
requesting status of said userid and said eventid;
determining whether an event message was previously sent;
generating a message from said event data;
sending information to said wireless component; and
recording status as to sending said information for said userid and said eventid.
17. The program storage device in claim 15, wherein said maintaining and said updating of said event managed data and said event subscribed data includes:
obtaining a new event object;
requesting said userids from a profile database wherein said event type matches said new event;
determining whether any more said userid;
requesting for each found said userid, a user location;
computing a distance of said user location and said event location using geo-spatial distance computations;
comparing said distance with an event distance threshold;
computing an event score for said user;
determining whether said event score exceeds said event score threshold; and
said notifying of said wireless component of said event subscribed data occurs when said event threshold distance and said score threshold are within predetermined values and there are no more said users.
18. The program storage device in claim 15, wherein said maintaining and said updating of said event managed data and said event subscribed data includes:
obtaining a new userid;
requesting said event type for said userid;
determining whether any additional event types;
requesting for each said event type, an event location;
computing a distance of said user location and said event location using geo-spatial distance computations;
comparing said distance with an event distance threshold;
computing an event score for said user;
determining whether said event score exceeds said event score threshold; and
said notifying of said wireless component of said event subscribed data occurs when said event threshold distance and said score threshold are within predetermined values and there are no more said events.
19. The program storage device in claim 15, wherein said method comprises a personal safety advisor and said event data comprises safety-related events and said profile comprises a safety profile.
20. The program storage device in claim 19, wherein said personal safety advisor includes calculating a weighted event score (WES) at said designated geo-spatial area defined as a product of ew*es, wherein ew is a weight associated with a safety-related event and es is a corresponding event score; and outputting said WES for display on said wireless component.
Description
    BACKGROUND OF THE INVENTION
  • [0001]
    1. Field of the Invention
  • [0002]
    This invention generally relates to wireless communication components and more particularly to global positioning satellite (GPS) technology/wireless communication integration of such components, and notifies a person or object that they are at or near the geo-spatial location of a significant event of subscribed data by the person or object.
  • [0003]
    2. Description of the Related Art
  • [0004]
    Rapid advances are being made in the field of wireless communication. An increasing number of applications are being developed for the wireless device platform, ranging from smart cellular phones to two-way text pagers. By the year 2001, new cellular phones are required to have a location-tracking device based on the global position satellite (GPS) network. This gives rise to systems that deliver real-time, location-based information and services to wireless subscribers. Typically, a wireless application retrieves data from a server to the wireless handset when the user invokes a specific function in the handset. For instance, a user might request flight departure time information from the server of an airline. In many cases, however, it is desirable to deliver (“push”) information to the user on a continuous basis. Personal safety is one important aspect where push technology is required. To illustrate, U.S. Pat. No. 6,144,336, discloses a positional, time-stamped based wireless communication GPS/wireless component network having “911” emergency number capability.
  • [0005]
    However, such systems do not provide complex geo-spatial related data (information) to a user while using wireless-based components to make informed decisions where an awareness of location-based event information is necessary. Examples of such location-based event information include crime reports; traffic safety reports; and environmental hazard reports.
  • [0006]
    Thus, there is need for the ability to concurrently monitor several geo-spatial related data (information) sources, for example, earthquake reports, accident reports, and safety-related news in the user's vicinity. This data can then be used for alerting them accordingly to take appropriate action. Further, there is need to provide data of future and past events dependent upon a current geo-spatial location. The present invention solves these problems by providing a real-time, location-based information system that continuously delivers information to the user's wireless handset, helping them maintain an awareness of events in their vicinity and assisting them in taking appropriate action.
  • SUMMARY OF THE INVENTION
  • [0007]
    It is, therefore, a primary object of the present invention to provide a system and method for communication of data (information) that has particular significance to a specific location only to those individuals that are at or near that location. A common use of the invention is to deliver location-based safety information to users. The invention allows information to be tailored to the individual at that location by selective filtering of what is communicated.
  • [0008]
    The system of the invention includes a transmitting proximity event server, a GPS client wireless component that can be a personal wireless Personal Digital Assistant (PDA) communication device (such as Palm Pilot, cellular digital phones, etc.) or a personal computer configured for use within a global positioning satellite network. In a preferred embodiment, the invention comprises a “personal safety advisor” system that continuously tracks location-based event information such as earthquake and accident reports and compares the current hazard level to the user's profile information. When the hazard level exceeds a threshold set by the user, the user is notified of the event and the information can be prominently displayed on the user's wireless handset. Various non-safety related applications of the invention include tourists who are near interesting attractions, or people who may be close to a book store where their favorite author is having a book signing.
  • [0009]
    It is another object of the invention to provide a method of activating geo-spatial dependent data using a server and a global positioning satellite-based wireless component, wherein the method comprises receiving input event data associated with a designated geo-spatial area at the server, maintaining and updating the event managed data and event subscribed data at the server, matching a profile that is subscribed to by a user when the user enters the designated geo-spatial area, and notifying the wireless component of the event data.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0010]
    The foregoing and other objects, aspects and advantages will be better understood from the following detailed description of a preferred embodiment of the invention with reference to the drawings, in which:
  • [0011]
    [0011]FIG. 1 is a schematic diagram of a hardware system adapted to implement the invention;
  • [0012]
    [0012]FIG. 2 is a flowchart diagram showing how the matcher is triggered by an event manager according to the invention;
  • [0013]
    [0013]FIG. 3 is a flowchart diagram showing how a matcher is triggered by a session manager according to the invention;
  • [0014]
    [0014]FIG. 4 is a flowchart diagram showing how a notification component is triggered by a matcher according to the invention;
  • [0015]
    [0015]FIG. 5 is a flowchart diagram showing how the session manager operates according to the invention; and
  • [0016]
    [0016]FIG. 6 is a flowchart diagram of an event manager operation according to the invention.
  • DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION
  • [0017]
    The purpose of this invention is to present a global positioning satellite-based wireless component user with a geo-spatial activated system and method.
  • [0018]
    An exemplary implementation of system hardware of the invention is shown in FIG. 1. The event proximity activated system 10 includes two main components: a GPS client wireless component 2 and a proximity event server 3.
  • [0019]
    As illustrated in FIG. 1, a typical configuration of an information handling/wireless communication system in accordance with the invention has a central processing units in both the server 3 and the wireless component 2. Each of these central processing unit could include various mapping units, weighting units, classification units, clustering units, filters, adders, subtractors, comparators, etc. Alternatively, as would be known by one ordinarily skilled in the art given this disclosure, multiple specialized CPU's (or other similar individual functional units) could perform the same processing, mapping, weighting, classifying, clustering, filtering, adding, subtracting, comparing, etc. Moreover, although the stored databases as shown in FIG. 1 reside in the event server 3, specialized databases can be incorporated in the wireless component 2 wherein the user can access data locally.
  • [0020]
    An “event” is defined as always being associated with a geo-spatial location. GPS 1 is the existing GPS satellite network. Through an event channel, which receives events through an event producer subsystem through an “Event Stream” to an event manager 34 and event database 39; an event management and subscription subsystem comprising session manager 31, a location database 35, a user profile database 37, and a session manager 31 which enables a person to subscribe to a particular event; and a profile matching and notification subsystem including a notification unit 38 with a matcher 33, which receives periodic updates of a person's position, sends alerts or notifications to persons, based on subscribed events through a wide area network (WAN) interface 32 to a subscription based GPS client wireless component 2. A global positioning satellite GPS 1 transmits positional information to the wireless component 2 through antenna 25.
  • [0021]
    The GPS Client Wireless Component 2 (CWC) may be implemented on a laptop computer, cell phone, personal digital assistant (PDA) or integrated in a car system having a wireless wide area network (WAN) connection 23 for communicating with proximity event server 3. CWC includes a GPS interface 22 for receiving location information. Tasks of this component are to know where the location of the current user is, and then to send this information to the server 3. In addition, the CWC will receive data from the proximity event server 3 and displays it for the user on a display device 27 a.
  • [0022]
    The GPS client wireless component 2 operates under the control of the respective session manager 21. The session manager 21 is responsible for the interaction between the subcomponents of the CWC. It prepares the incoming data, such as location and data to send them either further to the proximity server 3 over the WAN interface 23 or displays them over the GUI 24 on a screen 27 a.
  • [0023]
    The GPS interface 22 is implemented as a miniaturized GPS receiver that measures the time a radio signal needs from a GPS satellite in the GPS system 1 until it arrives at the GPS antenna 25. Knowing the speed of the radio signal (approximately the speed of light), and when each signal is transmitted, the distance to each of the satellite can be determined. The final solution of the equations produces an exact position of the antenna 25 (latitude, longitude). The GPS receiver interface 22 determines a current location of the GPS client wireless component 2 and supplies the current location to the session manager 21.
  • [0024]
    The WAN interface 23 supports a wireless connection to the Internet. With this interface the GPS client wireless component 2 can always be connected to the proximity event server 3. The graphic user interface 24 (GUI) is implemented in GPS client wireless component 2 for an easy-way to configure and to administrate the GPS client wireless component 2. A GPS antenna 25 connects to the GPS interface 22 to receive GPS data from the GPS satellite system.
  • [0025]
    The WAN transceiver antenna 26 is for the wireless connection to the Internet. It is connected to the WAN interface 23 of the GPS client wireless component 2. The output device 27 may be implemented as a display of a wireless device end the input device 27 b as a touch screen. The touch screen is used for manual user inputs and configuration. The display is for output of messages.
  • [0026]
    The proximity event server 3 identifies people who are close to a location that contains an event or events that might be interesting or important to those people. It then sends them an alert or notification. The session manager 31 gets the location information of users over the WAN interface 32. It stores this information in a location database 35 and notifies the matcher 33 of the new location of a user by sending the user id to the matcher. The WAN interface 32 supports the connection to the Internet for the communication/interaction between the server 3 and user clients 2. When the matcher 33 is notified by the session manager 31 of the new location of a user, it measures the distance between the user's new location and all event locations in the event database 39 by requesting them from the event manager 34. A weighted event score is also computed for the user; the weighted event score is based on the scores of the events and their corresponding weights as defined by the users profile 37. If the measured distance is less then an event distance threshold value and the weighted event score exceeds a user-defined event score threshold value stored in the users profile 37, the matcher 33 will notify the notification unit 38.
  • [0027]
    When the matcher 33 is notified by the event manager 34 of a new event, it measures the distance between all users' locations and the new event's location. As in the previous case, a weighted event score is also computed for the users, based on the score of the event and the corresponding weight assigned by each users profile 37. If the measured distance is less then an event distance threshold value and the weighted event score exceeds a user-defined event score threshold value stored in the users profile 37, the matcher 33 will notify the notification unit 38.
  • [0028]
    Examples of events that a typical user might be interested in (as defined by their profile) include reports about earthquakes, chemical spills and other accidents, and other news. The event distance threshold value and the event score threshold value are configured for and by each user in their profile, allowing them to control the amount of event information delivered to them by the system. A trivial modification of this scheme is to associate the event distance threshold value with an event, not with a user-event combination, and using the same event-specific value for every user.
  • [0029]
    The event manager 34 manages the incoming events from an event stream and stores them to the event database 39. It also assigns an event score to each event; the score indicates the relative importance of the event and ranges in value from zero to one. Incoming events could be new, and thus do not exist in the database 39 yet, or are already present, and need to be updated (events which change dynamically). However, if a new event is coming in, the event manager 34 informs the matcher 33 of the new event.
  • [0030]
    The location DB 35 stores a users locations for measuring the distance between user and events location. The user location record could be as follows: (user id, location in latitude/longitude). The Status DB 36 contains status information for all users, if a specific event has already sent to the user or not. The notification component 38 needs this information for not sending the same event to the same user several times (event flooding). The status record could be as follows: (user id, event id, send status).
  • [0031]
    The profile DB 37 contains information for which events a user is interested in. Users are able to subscribe to specific event types and indicate their preferred event distance threshold value and event score threshold value. The matcher 33 needs this information to decide whether to inform the user of new incoming events or not. The profile record could be as follows: (user id, event type, event distance threshold, event score threshold, event score weight). The event score weight and event score threshold range in value from zero to one.
  • [0032]
    The notification unit 38 is triggered by the matcher 33. Before it sends a notification to a user, e.g. as e-mail, SMS message, XML document, it makes sure that this event has not already been sent to the user. To achieve this, the notification unit 38 requests the user status from the status DB 36 for a specific user and event.
  • [0033]
    The event DB 35 contains event information of specific events. These records are updated dynamically by receiving events from an event stream. A record in this table will be deleted when its lifetime has expired. The event database 35 is managed by the event manager 34. An event might be represented as an object with attributes: Event Object:(event id, event type, event description, event location, event score, lifetime). The event objects might be described for instance in XML or as a Java object. Distance can be at a specific location and up to a certain distance from that specific location to provide a geo-spatial location of interest (e.g. a 2-km range from a certain location). Event score indicates the relative importance of the event and is assigned by the event manager 34.
  • [0034]
    Methods of activating a subscribed event by distance can include several methods of geo-spatial distance computation. These include computations of distance in kilometers between any two locations on the planet by giving their latitude and longitude as: Lat1=Latitude of first position (degrees); Lat2=Latitude of second position (degrees); Long1=Longitude of first position (degrees); and Long2=Longitude of second position (degrees) wherein: Distance (kms)=1.852*60*ArcCos(SIN(Lat1)*SIN(Lat2)+COS(Lat1)Lat2)*COS(Long2−Long1))). Other forms of computing distance include well known software code that computes the distance between two latitude and longitudinal positions using a great circle distance.
  • [0035]
    A weighted event score (WES) is computed for a user-event combination as WES=ew*es; where ew is the user-defined weight associated with events of that type and es is the corresponding event score assigned by the event manager 34. The weights are retrieved from the user's profile 37 and range from zero to one. Since the event score es ranges from zero to one, the value of the weighted event score WES ranges also ranges from zero to one.
  • [0036]
    Referring now to FIG. 2, a flowchart diagram shows how the matcher 33 is triggered by the event manager 34. Specifically, at step 201, the system 10 waits until prompted. At step 202, the invention obtains a new event object from the event manager 34. At step 203, a request userids from profile DB 37 is obtained where an event type matches a new event. At step 204, the invention determines whether any additional userids were found. If so, proceed to step 205 wherein for each found userid, request user location from the location DB 35. If no at step 204, then the process begins again by going back to step 201.
  • [0037]
    Next, at step 206, compute the distance between the user's location and the event's location using geo-spatial distance computations as discussed above. At step 207, if the distance is less than a user-defined event distance threshold, proceed to step 209 to compute the aggregate event score for the user. At step 210, determine whether the aggregate event score exceeds the event score threshold value for the user. If yes, proceed to step 211 and deliver the user data and event data to the notification component 38.
  • [0038]
    At step 207 and at step 210, if the decision was no, proceed to step 208 to determine if there are more users. If not, start over at step 201 or proceed to step 206 again until there are no more users.
  • [0039]
    Referring now to FIG. 3, a flowchart diagram shows how the matcher 33 is triggered by the invention's session manager 31. Specifically, at step 301, the system 10 waits until prompted. At step 302, the invention gets a new userid from the session manager 31. At step 303, the invention requests userids from profile DB 37. At step 304, the invention determines if there are any additional event types found. If yes, the invention proceeds to step 305 wherein for each found event type, request event location from the event manager 34. If no, then the invention goes back to step 301.
  • [0040]
    Next, at step 306, compute the distance between the events location and the users location using geo-spatial distance computations as discussed above. At step 307, if the distance is less than a predetermined threshold distance, proceed to step 309 to compute the aggregate event score for the event. At step 310, determine whether the aggregate event score exceeds the event score threshold value for the user. If yes, proceed to step 311 and deliver the user data and event data to the notification component 38.
  • [0041]
    At step 307 and at step 310, if the decision was no, proceed to step 308 to determine if there are more users. If not, start over at step 301 and proceed to step 306 again until there are no more events.
  • [0042]
    Referring to FIG. 4, a flowchart diagram shows how the invention's notification component 38 is triggered by the matcher 33. Specifically, at step 401, the system 10 waits until prompted. At step 402, the invention obtains user data and event data from the matcher 33. At step 403, a request status is made for userids and eventids from status DB 36. At step 404, the invention determines whether an event message was already sent? If no, the invention proceeds to step 405 and generates a message from the event data. If yes, the invention goes back to step 401. At step 406 after step 405, a message is sent to a user over the WAN interface 32. At step 407, set status as being sent for this userid and eventide
  • [0043]
    In FIG. 5, a flowchart diagram shows how the invention's session manager 31 operates. Specifically, at step 501, the system 10 waits until prompted. At step 502, get new location for a userid from the user client wireless component 2. At decision step 503, a determination is made whether a valid userid exists. If no, a nonsubscribing user must sign up in step 505. If yes, proceed to step 504 to update location for userid in the location DB 35. Finally, at step 506, the invention sends userid to the matcher 33.
  • [0044]
    In FIG. 6, a flowchart diagram shows how the invention's event manager 34 operates. Specifically, at step 601, the system 10 waits until prompted. Next, at step 602, the invention gets a new event object from the “Event Stream.” At step 603, does the Event exists in the event DB? If yes, the invention goes to step 604 and update event in event DB 39. If no, the invention goes to step 606 and adds new event to event DB 39 and the invention proceeds to step 605 which sends event object to the matcher 33. After step 604, the invention goes to step 605 and then the invention goes back to step 601.
  • [0045]
    A preferred use of the invention is to provide geo-spatial event data, some examples of which include: crime reports(e.g. robbery or terrorism); traffic safety reports (accidents, visibility, slippery road); and environmental hazard reports (nuclear radiation, chemical spills, weather phenomena, natural disasters, fire).
  • [0046]
    While the overall methodology of the invention is described above, the invention can be embodied in any number of different types of hardware systems and executed in any number of different ways, as would be known by one ordinarily skilled in the art. In particular, various applications of the invention include accident alerts, news alerts, alerts for tourists who are near interesting attractions, or people who may be close to a book store where their favorite author is having a book signing. In the future, automobiles that have on-board computers and GPS receivers can provide an integrated traffic safety system that alerts the driver of any nearby accidents or other noteworthy events.
  • [0047]
    In summary, the invention provides a system and method for communicating data of significance to a specific location only to those individuals that are at or near that location using wireless based components. In particular, where safety is of great significance and being the subscribed to information by a user, such information is tailored to that individual at that location by selectively filtering what is communicated and what is not.
  • [0048]
    While the invention has been described in terms of preferred embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the appended claims.
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Classifications
U.S. Classification340/686.1, 707/E17.018
International ClassificationG01C21/20, G06F17/30, H04L29/08, G08B27/00, H04L12/18, H04W4/02, G01S19/48, G01S5/14
Cooperative ClassificationH04L67/16, H04L67/26, H04L67/18, H04L67/306, H04L67/22, H04L69/329, G08B27/005, G06F17/30241, G01C21/20, H04L12/189, H04W4/02, G08B27/006, H04L12/1859, H04L12/1895
European ClassificationH04L29/08N21, H04L12/18P, G08B27/00P, G08B27/00N, H04W4/02, H04L29/08N15, G06F17/30L, H04L29/08A7, H04L29/08N17, H04L29/08N25, H04L29/08N29U, G01C21/20
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